Editing MacVTap

[[wikipedia:MacVTap|MacVTap]] is a device driver meant to simplify virtualized [[bridged]] networking.<ref>https://virt.kernelnewbies.org/MacVTap</ref> Typically, this is used in virtualized environments ([[KVM]]) to make both the guest and the host show up directly on the switch that the host is connected to and to improve throughput and latencies to external systems. <ref>https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liaag/wkvm/wkvm_c_net_macvtap.htm#fntarg_1</ref>


Example configuration file:
<pre>
<interface type=”direct”> 
    <mac address=12:34:56:78:9a:bc/> 
    <source dev=private1 mode=bridge/> 
    <model type=virtio/>    
    <driver name=vhost/> 
</interface>
</pre>
The MAC address field is optional, if omitted, the [[kVM/libvirt|libvirt]] daemon ([[kVM/libvirt|libvirtd]]) will generate a unique MAC address.


Example Virtual Machine using MacVTap driver in mode bridge:
* <code>virt-install --autostart --check all=on --name YOUR_VM_MACHINE --memory VM_MEMORY --vcpus VM_CPUs --os-variant ubuntu18.04 --cdrom VM_INSTALLATION_MEDIA --disk /path/libvirt/VM_STORAGE_POOL_NAME/YOUR_VM_MACHINE.qcow2 --noautoconsole --wait TIME_TO_WAIT --network type=direct,source=eno111,source_mode=bridge,model=virtio</code>


== Activities ==
# Learn about different MacVTap modes: https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liaag/wkvm/wkvm_c_net_macvtap.htm#fntarg_1
# Learn about MacVtap isolation and limitations https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liaag/wkvm/wkvm_c_net_macvtap.htm#fntarg_1
# Learn about [[KVM]] Host Networking Configuration Choices https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liaag/wkvm/wkvm_c_net.htm

== See also ==
* [[KVM]]
* virsh command line utility 
* virtinst python installer scripts 

[[Category:Linux]]

{{CC license}}
Source: wikiversity
@@ Line 1: / Line 1: @@
-[[wikipedia:MacVTap|MacVTap]] is a device driver (<code>type="direct"</code>) meant to simplify virtualized [[bridged]] networking.<ref>https://virt.kernelnewbies.org/MacVTap</ref> Typically, this is used in virtualized environments ([[KVM]]) to make both the guest and the host show up directly on the switch that the host is connected to and to improve throughput and latencies to external systems. <ref>https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liaag/wkvm/wkvm_c_net_macvtap.htm#fntarg_1</ref>
+[[wikipedia:MacVTap|MacVTap]] is a device driver meant to simplify virtualized [[bridged]] networking.<ref>https://virt.kernelnewbies.org/MacVTap</ref> Typically, this is used in virtualized environments ([[KVM]]) to make both the guest and the host show up directly on the switch that the host is connected to and to improve throughput and latencies to external systems. <ref>https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liaag/wkvm/wkvm_c_net_macvtap.htm#fntarg_1</ref>
-Example configuration file <code>[[/etc/libvirt/qemu/]]</code>:
+Example configuration file:
+<pre>
- <interface type="[[direct]]">
+<interface type=”direct”>
-     <mac address=12:34:56:78:9a:bc/>
+    <mac address=12:34:56:78:9a:bc/>
-     <source dev=private1 mode=bridge/>
+    <source dev=private1 mode=bridge/>
-     <model type=[[virtio]]/>
+    <model type=virtio/>
-     <driver name=vhost/>
+    <driver name=vhost/>
- </interface>
+</interface>
+</pre>
-The MAC address field is optional, if omitted, the [[libvirt]] daemon ([[libvirtd]]) will generate a unique MAC address.
+The MAC address field is optional, if omitted, the [[kVM/libvirt|libvirt]] daemon ([[kVM/libvirt|libvirtd]]) will generate a unique MAC address.
 Example Virtual Machine using MacVTap driver in mode bridge:
-* <code>[[virt-install]] --autostart --check all=on --name YOUR_VM_MACHINE --memory VM_MEMORY --vcpus VM_CPUs --os-variant ubuntu18.04 --cdrom VM_INSTALLATION_MEDIA --disk /path/libvirt/VM_STORAGE_POOL_NAME/YOUR_VM_MACHINE.qcow2 --noautoconsole --wait TIME_TO_WAIT --network type=direct,source=eno111,source_mode=bridge,model=virtio</code>
+* <code>virt-install --autostart --check all=on --name YOUR_VM_MACHINE --memory VM_MEMORY --vcpus VM_CPUs --os-variant ubuntu18.04 --cdrom VM_INSTALLATION_MEDIA --disk /path/libvirt/VM_STORAGE_POOL_NAME/YOUR_VM_MACHINE.qcow2 --noautoconsole --wait TIME_TO_WAIT --network type=direct,source=eno111,source_mode=bridge,model=virtio</code>
- error: error creating macvtap interface macvtap0@vnet0 (xx:54:00:7d:1c:xx): Device or resource busy
- ifconfig -a macvtap0
- macvtap0: flags=4419<UP,BROADCAST,RUNNING,PROMISC,MULTICAST>  mtu 9000
-         inet6 fe80::5054:ff:feb5:3ef9  prefixlen 64  scopeid 0x20<link>
-         ether 52:54:00:b5:3e:f9  txqueuelen 500  (Ethernet)
-         RX packets 9669  bytes 936225 (936.2 KB)
-         RX errors 0  dropped 0  overruns 0  frame 0
-         TX packets 9271  bytes 2037747 (2.0 MB)
-         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 == Activities ==
@@ Line 35: / Line 22: @@
 # Learn about MacVtap isolation and limitations https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liaag/wkvm/wkvm_c_net_macvtap.htm#fntarg_1
 # Learn about [[KVM]] Host Networking Configuration Choices https://www.ibm.com/support/knowledgecenter/en/linuxonibm/liaag/wkvm/wkvm_c_net.htm
-# Read  Introduction to Linux interfaces for virtual networking https://developers.redhat.com/blog/2018/10/22/introduction-to-linux-interfaces-for-virtual-networking/
-# Read about <code>[[trustGuestRxFilters]]</code> option
-# Learn about MacVTap and VMware https://unix.stackexchange.com/questions/203926/macvtap-on-vmwares-vm
 == See also ==
-* {{KVM networking}}
+* [[KVM]]
-* {{virsh net}}
+* virsh command line utility
+* virtinst python installer scripts
 [[Category:Linux]]